文档介绍：:..×49/9-4/×15/36+1/×5/6–2/9××5/4+1/÷3/8–3/8÷×5/9+3/7×5/-(3/2+4/5)+(1/8+1/9)×5/6+5/×8/9-1/×5/49+3/×49/9-4/×15/36+1/×5/6–2/9××5/4+1/÷3/8–3/8÷×5/9+3/7×5/-(3/2+4/5)+(1/8+1/9)×5/6+5/×8/9-1/×5/49+3/×(1/2+2/3)×4/5+8×11/-(2/7–10/21)×25/16+2/3×3/×8/7–5/6×12/–3/4×9/×2/9+1/×3/25+3/××2/3+1/×2/3+5/+1/11÷1/×11/5+4/×2/3+1/3×+12/19×5/+3/4÷2/×21/16+1/×1